Portable exhaust gas conveyer



F. E. BRADY, JR 2,598,884

PORTABLE EXHAUST GAS CONVEYER Filed Oct. 27, 1949 June 3, 1952 INVENTOR. FKH/VSEEk/); JK.

Patented `I'une 3, 1,9521

UNITED STATES PATENT OFFICE PORTABLE EXHAUST GAS CONVEYER Francis E. Brady, Jr., Muncie, Ind.

Application October 27, 1949, Serial No. 123,929

4 Claims.

This invention relates to a. portable exhaust gas conveyor particularly adapted for use in small garages and service stations for conveniently eliminating exhaust fumes and vapors from a running motor.

All closed-in garages and service stations must have some manner of conveying the exhaust gases discharged from the exhaust pipe of running motors from the building due to the deadly nature thereof. In the larger service stations elaborate equipment is generally employed which is beyond the needs or the practicability to install in the small service stations and garages. This is particularly true in respect to those service stations and garages which rent the premises and would hesitate to invest in a substantial installation which would remain a ilxed part of the building.

It is, therefore, the purpose of this invention to provide 4a small portable unit which may be readily connected and disconnected both from the automobile exhaust pipe and from a removable outlet in the building, and also be transported to different locations within the building in accordance with the needs of the mechanic.

One of the problems involved in such devices is to eliminate back pressure on the engine in exhaust such as to effect the operation of the motor. It is, therefore, desirable to provide means for conveying the exhaust gases from the engine exhaust in such a manner as to boost the flow of exhaust gases rather than retard it irrespective of the speed of the operation of the motor. Another problem involved has to do with the high temperature of exhaust gases passing through a hose which must either be suitably insulated or cooled down to a temperature which would not inflict burns upon being touched.

To overcome the above problems the portable unit of this invention, including a movable carriage, embodies a motor driven high pressure blower which, through one or more blower jets and Venturi chambers, induces a suction on the exhaust pipe to eliminate back pressure and dilute the gases with fresh cool air for substantially lowering the temperature thereof before the combined gases and cool air enter the discharge hose leading to the outlet in the building.

Another feature of the invention resides in the universal intake adaptor bag for conveniently connecting the intake hose of the device with exhaust pipes of varying dimensions and form. This is accomplished by providing a ilexible asbestos bag having one end sealed to the intake hose and the other end large enough to mount over any size or shape of exhaust pipe to be tightly drawn into sealing engagement thereabout.

A further feature of the invention resides in an assembly fitting between the terminal end of the discharge hose and one or more outlet iixtures conveniently mounted in a wall, window or door of the building.

The full nature of the invention will be understood from the accompanying drawings and the following description and claims:

Fig. 1 is an illustrative view of the exhaust conveyor in operative relation to a running motor and outside wall.

Fig. 2 is a central vertical section through the conveyor.

Fig. 3 is an enlarged section through the jets and Venturi chambers.

In the drawings there is shown for purposes of illustration the rear end III of a motor driven vehicle having an exhaust pipe to which the conveyor, generally indicated at II, is connected through an asbestos bag intake adaptor I2 and flexible intake hose I3. Leading from the exhaust conveyor there is a flexible discharge hose I4 having a detachable outlet fitting I5 removably connected to an outlet fixture I6 mounted in an outside door I1 of the building.

The portable exhaust conveyor includes a housing I8 mounted on a suitable under carriage having rollers I9 and surmounted by a convenient handle 20 whereby it may be transported to various locations in the building, depending upon the position of the car being serviced. The housing I8 supports a motor carriage 2| on which is mounted an electric motor and high pressure blower indicated at 22. Depending from the motor carriage 2I and blower there is provided a funnel-like member 23 terminating in a downwardly-extending primary nozzle 24. Through operation of the motor and blower air is drawn upwardly from the bottom of the housing and discharged downwardly through the nozzle 24 at high velocity.

The intake hose I3 extends into the housing for connection with a blower jet chamber 25 surrounding the nozzle 24 into which the hot gases from the exhaust pipe are drawn through the action of the high velocity air discharged from the nozzle, the hot gases and the cooling air being mixed within said chamber and discharged at high velocity through a primary Venturi chamber 26, having a restricted diameter with respect to that of the chamber 25.

The primary Venturi chamber 26 terminates in a secondary nozzle 21 discharging the combined hot gases and cooling air into a restricted secondary Venturi chamber 28. The secondary Venturi chamber is open to the atmosphere in any suitable manner such as provided by the outwardly flared funnel-like walls 29 opening outwardly from and above the discharge end of the secondary nozzle 2l. Due to the high velocity of the gas and air discharged from said nozzle through the restricted secondary venturi, additional cooling air is drawn into the venturi for further cooling of the hot gases.

Leading from the lower end of the secondary Venturi chamber there is provided a duct in the form of an elbow 28a ared at its lower end and secured to the housing for opening therefrom, as indicated at 30. provided with a conical end fitting 3| having a sliding sealed t with the conical end of the elbow 29 whereby the air diluted gases at reduced -temperature are discharged into said hose. The outlet end of the hose I4 is provided with the conical outlet tting I5 for removably fitting in telescoping fashion over the mating conical portion of the outlet xture I6, ldischarging into the atmosphere therethrough.

For providing a convenient connection between the intake hose I3 and the exhaust pipe of .the automobile engine indicated at 32, the intake .adaptor I2 is in Athe Yform of an asbestos bag of suflicient diameter to embrace any size or shape of exhaust pipe. Said bag is preferably maintained in expanded position by an internal spiral wire 33 and has one end thereof Y'tapered `at -34 for permanent sealing engagement -about the intake end of the hose I3. At the other end V of the bag there is provided a clamping chain 35 for drawing the intake end Vof the Abag tightly about and in substantially sealing engagement with A.the `exhaust pipe.

In operation, it may be considered that hot exhaust .gas is delivered from the exhaust pipe at a temperature up to 600 F. and .with a capacity up to y100 cubic feet per minute at a high `velocity of over 100 feet per second. It, therei fore, vbecomes necessary'to both reduce this high temperature to a temperature which will not be dangerous to the touch without developing a `back pressure on the exhaust such Yas -to interfere with the proper operation ci the motor.

lThe exhaust at this temperature and velocity is carried to the blower jet chamber 25 in vwhich vchamber A.cooling -air is being discharged at approximately the rate of 5 cubic feet per minute from the primary nozzle 24 into the Venturi .chamber 25, developing a drop inY pressure on YHowever, wherein the V.motor may be operated .at high speed for service testing, it may be desirable to provide a second stage of temperature ,atmosphere reduction. For this purpose the secondary nozzle vand 'venturi are provided with an additional air intake. Thus, as the mixture of=gas and cooling air discharges through the secondary nozzle -21 into the secondary venturi :28, additionalcharge of cooling air is drawn The discharge hose I4 yisv .therein and Lthe V:temperatureof the mixture15 further reduced before entering the exposed and relatively long discharge hose I4. When the mixture of gas and cooling air passes through the discharge hose, the temperature has been reduced to a safe limit so that body contact with the discharge hose will no longer be dangerous.

From the foregoing it will be'observed that with a small portable compact unit the exhaust gases may be discharged without resort to large and high powered permanent equipment with no eiect on the motor operation and without danger resulting from exposed high temperature conduits.

The invention claimed is:

1. -A portable automobile exhaust gas conveyor comprising a housing, a wheel supported carriage for said housing, a handle connected with said housing for permitting of its movement from one location to another, means mounted in said housing having a discharge nozzle through which cooling air is discharged, a Venturi chamber associated with said nozzle, ,a conduit connected with-said chamber and extending through said housing for a removable connection with the exhaust pipe of an automobile to receive hot exhaust gases therefrom,

a discharge conduit vconnected with the discharge end of said Venturi chamber and opening through said housing, and arflexible'discharge hose adapted for removable-connectionbetween the exposed end of said'conduit and aselected location4 for conveyingV therefrom a Vmixture of hot` exhaust gases and cooling air at a--substantially reduced temperature.

2. A portable automobile Aexhaust vconveyor for connection with an automobile-exhaust pipe including a metal conduit, an enlarged'flexible bag having one end sealed about said conduit and the other end adapted to be appliedfabout the .exhaust pipe, va vmovableV carriage forsaid conveyor, a clamping element Viordrawing the end of said bag into sealing engagement labout said exhaust pipe, a discharge conduit comprising a flexible hoseof greater diameter zthan said exhaust pipe and Yintake conduit, and a blower interposed between the Vother-.endsof said conduits for directing cooling air through said last-mentioned conduit in mixed Yrelation with said exhaust gases 'to reduce the 'temperature thereof and induce a partial vacuum vin `said rst-mentioned conduit.

3. A portable exhaust conveyor for connection with an automobile exhaust ypipe through which hot gases are exhausted, including ani inlet conduit leading from said pipe to a Venturichamber in said conveyor, a movable 'carriageifor said conveyor means having a nozzle for' discharging cooling air through said Venturi chamber to develop a pressure drop insaid conduit andlreduce the temperature of the lexhaust gases received therefrom, and a discharge conduit Ieadin'g'from said Venturi chamber for conveyingthe mixture of'gas-and cooling air to afselected location at a substantially reduced temperature. i

4. A portable exhaust conveyor for connection with an automobile exhaust pipe through which hot gasesare exhausted, including a jet chamber in said conveyor terminating rin a primary Venturi chamber, a .movable-carriage for. said conveyor, an inlet conduit leading from. said pipe to said jet chamber, means having avprimary, nozzle projecting `into said jet chamber for introducing cooling-'air therein and-develcping-a pressure dropl in said conduit, a secondary nozzle leading from said jet chamber, a secondary Venturi chamber embracing said secondary nozzle and open to the atmosphere for drawing additional cooling air into mixing relation with said hot gases, and a discharge conduit leading from said secondary Venturi chamber for conveying the mixture of gas and cooling air to a selected location at a substantially reduced temperature.

` FRANCIS E. BRADY, JR.

REFERENCES CITED The following references are of record in the fue of this patent:

Number 10 Number UNITED STATES PATENTS Name Date Stougaard Sept. 27, 1932 Coppus Apr. 18, 1933 Gieslingen Sept. 29, 1936 Stickler Apr. 4, 1944 y FOREIGN PATENTS Country Date Germany May 28, 1941 

